Trivia

In GTA IV's audio files, this manufacturer is misspelled as "Zireonium" and is mispronounced by the police as "Zireoenium".[1] Interestingly enough, a sound clip with the same mispronounciation can be found in GTA V's files that was probably recorded before being corrected.

Zirconium is a frequently used material for making cheap diamonds. This is maybe a reference to the Stratum's low impact resistance and low build quality.